基于卤氧化铋异质结复合物光解水制氢的研究

项目名称： 基于卤氧化铋异质结复合物光解水制氢的研究

项目编号： No.51272303

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 张玲

作者单位： 中国科学院上海硅酸盐研究所

项目金额： 80万元

中文摘要： 光催化分解水制氢，是太阳能燃料研究的热点。 本项目拟将两种或多种卤氧化铋BiOX(X=F, Cl, Br, I)通过自组装等手段组合成具有宽光谱响应、结构可控的新型高效光催化材料, 并借助于有机污染物废液中的有机小分子醇或酸作为空穴牺牲剂来提升光生电子的光催化还原反应效率，构建高效率的光催化分解水制氢/光催化降解反应体系, 达到最大限度利用太阳能的目的。通过调控复合光催化材料中不同卤氧化铋组分的比例及组成结构, 研究不同卤氧化物之间的界面、电子结构特征和光生电荷的寿命行为，建立异质结界面对光生电荷迁移传输行为的作用机制以及对复合光催化剂能带的调控机制。通过原位的光电流监测和在线气相色谱监测, 研究有机废液中的空穴牺牲剂的种类和浓度与光生电流及光催化剂材料表面产H2量之间的关系, 进而指导并制备出高量子效率、宽光谱响应、高稳定性为特征的卤氧化铋异质结光解水制氢材料。

中文关键词： 光催化；氧空位；卤氧化铋；光解水；二氧化碳还原

英文摘要： Photocatalytic water splitting has been considered as a promising strategy of converting solar energy into hydrogen energy. This proposal focuses on the bismuth oxyhalide compounds composed by two or more kinds of BiOX (X=F, Cl, Br, I) by self-assembly methods. With the organic pollutant (alcohol, acid molecular etc.) as a as electron donors, the novel UV-visible light photocatalysts will supply a high efficient photocatalytic water splitting/ photocatalytic degradation system, by which the solar energy will be used maximum. We will tune the microstructures and band structure of the bismuth oxyhalide compounds by controlling the ratio of the BiOX (X=F, Cl, Br, I). The geometry interface of the compounds, electron structure, life time of the charge carries will be studied to interpret the immigration mechanism of the charge carries at the heterostructure interface. Photocatalytic activities of the as-synthesized samples will be evaluated by in situ monitoring the photo-generated current and H2 production. The relationship between the crystal structure and photocatalytic properties would be set up and revealed. The wide spectral photocatalyst with efficiently photocatalytic H2 evolution rate and high stability would be realized by the support from this project.

英文关键词： photocatalysis；oxygen vacancy；bismuth oxyhalides；photocatalytic water splitting；CO2 reduction